Art of core making



W. A. SMITH.

ART OF CORE MAKING.

APPLICATION FILED SEPT. 2| 1921.

1,428,993. Patented-Septv 1922 A trorng Patented Sept. 12, 1922.

UNITED STATES WILLIAM A. SMITH, OF LYNN, MASSACHUSETTS.

ART OF CORE MAKING.

Application filed September 2, 1921. Serial No. 498,108.

To all whom it may concern Be it known that IVILLIAM A. SMITH, a citizenof the Jnited States, residing at Lynn, in the county of Essex andCommonwealth of Massachusetts, has invented certain new and usefulImprovements in the Art of Core Making, of which the following is such afull, clear, and exact description as will enable others versed in theart to which it appertains to make and use the same.

My invention relates to improvements in the art of core making and moreparticularly to a method for use in the manufacture of cores.

The objects of my invention are:

To provide an improved means and multiple method of making cores in gangboxes, by means of and in which are simultaneously molded series ofcoresof the varying types commonly used in foundries, for the making ofhollow castings.

To materially increase the production on the part of coremakers throughthe employment of the multiple process.

To resultingly reduce the cost of manufacture.

To provide an improved method of interlocking the base and coverportions of core boxes, eliminating the pin and socket constructionheretofore used. 3

To provide an improved method of venting cores in the process of theirmanufacture.

To eliminate the use of wheat or other cereal flours heretofore utilizedin the manufacture of cores.

To provide an improved means of amalgamating during the process ofmanufacture the component parts of cores.

To eliminate the use of bedding sand in the turning out process of coremaking.

To provide an improved dryer for use in the turning out and baking ofcores.

And to provide other advantages and results some of which will behereinafter referred to.

My invention embraces the method herein described, the steps of whichare included in the appended claims.

I accomplish the purposes of my invention as illustrated in theaccompanying drawing, in which Figure 1, shows the base portion of myimproved gang core box. Figure 2, shows my improved vent plate for usein connection with my improved gang core box. Figure 3, shows the coverportion of my improved core box. Figure 4: shows a cross section of myimproved base portion with the vent plate positioned thereon. Figure 5shows an end view of said base with the box cover positioned thereon.Figure 6 shows a cross section of the base with said box coverpositioned thereon.

Similar letters refer to similar parts throughout the various views.

Referring again to Figure 1, A shows the frame of the base portion. l3shows the series of cross-sectionally hemispherical channels in whichthe cores are formed. C and C are tenons formed on the ends of the baseportion which interlock in the mortises D and D of the vent plate and Eand E of the cover portion, Figures 2 and 3. In Figure 2. F shows theframe of the vent plate. G shows the ridges on the face of the platewhich produce in the core sand parallel indentations .known as the ventsof the cores. In Figure 3, H shows the frame of the cover portion of myimproved gang core box. I, shows the cross-sectionally hemisphericalchannels which con form in position, number and shape to thosedesignated as B in Figure 1, against which they fit so as to formcompleted core moulds. My improved moulds are made in various sizes andshapes so as to produce cores for any-and all requirements. Forconvenience merely the drawings represent the cylindrical type.

It will be understood that heretofore core making has been carried on infoundries by single unit making methods. By the use of improved meansand method I multiply production eifort and procure a correspondinglygreater result.

In the process of manufacture by my improved method the base portion ofmy core box, Figure 1, is filled with a mixture of oil and sand such asis ordinarily used for core making and known to the trade as core sand.

The sand is struck off smooth to the top of the base portion, Figure 1,after which the vent plate mold, Figure 2, is placed over,

and pressed down onto the core sand with which the base, Figure 1, hasbeen filled. The vent plate mold produces in the core sand parallelindentations which form the vent spaces known to be so essential in themanufacture of perfect cores. (It will be understood by those familiarto the art that these vents allow the escape of gases which generatewhen the cores are subjected to the heat of the molten metal used incasting.)

I The vent plate is then removed, and the top surface of the sand isdusted with a talc substance of magnesium and silica such as ordinarypowdered tale. The cover portion of the core mold, Figure 3, which hasbeen likewise filled with core sand is then placed face down on top ofthe base portion. The cover portion is next removed leaving a series ofperfectly molded oil sand cores. A

" dryer unit, preferably made from core sand hardened bybaking in theform of the cover portion, Figure 3, is then placed over the baseportion of the core box (containing the series of molded core sandcores). The base, contents, and core sand dryer .unit are then turnedupside down, this operation allowing the cores to rest upon the dryerunit. The

- base of the mold is then removed, and the dryer unit with the coresthereon is placed in the ovens that the cores may be properly hardenedby baking.

To those skilled in the art it is obvious that the method described is aradical change and improvement over and above the methods heretoforeknown and used. The old,

long tolerated, and troublesomeuse of wires in the formation of corevents is eliminated. The treatment of core sections, before joining,with the t'alc substance of magnesium and silica welds the sections intoone during the process of baking. The said method need not be followedexcept as specified in the claims, nor necessarily in the order namedand the method is therefore susceptible of modification.

Having thus described my invention I claim as new and desire to secureby Letters Patent of the United States of America.

1. In the art of core making the .method herein described comprising themoulding of core sections from a prepared core sand, treatment of thatportion of their exteriors which contact in assembling with an ordinarypowdered talc, and the subsequent baking of the assembled product, allsubstantially as described and for the reasons specified. 2. In the artof core making the method herein described comprising the molding ofcore sections with vents therein from aprepared core sand, treatment ofthat portion of their exteriors which contact in assembling with anordinary powdered talc, nd the subsequent baking of the assembledproduct, all substantially as described and for the reasons specified,

3. Ina device of the kind described a gang core base, a ridged face ventplate and a gang core cover, said base and plate and said base and coverhaving interlocking means to insure their fixed position with relationto eachother, all substantially as described and for the reasonsspecified.

4. In core-making apparatus, a gang-core base and a ridged vent-plateadapted to co- In testimony whereof I aflix my signature in. thepresence of two witnesses.

.WILLIAM A. SMITH.

Witnesses: I

DOROTHY F. BISHOP,

CHARLES WV. Lovnrir'r.

